Fix PEKA input mismatch by joining peaks and crosslinks on metadata #34
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This PR addresses Issue #33, where PEKA runs are using unmatched peak and crosslink files across samples.
The problem was caused by CLIPPY_GENOME.out.peaks and ch_genome_crosslink_bed being passed separately to the PEKA module without matching on sample metadata.
This fix joins the two channels by metadata using .join(..., by: 0) and maps them into the PEKA process, ensuring proper sample pairing.